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Vietnam disaster risk prevention aid system for urban flooding
- 1. Dr. Lee, ByoungJae Director of Urban Disaster Prevention & Water Resource Research Center
- 2. Background and Importance UrbanFlood Management Strategy Disaster Risk Prevention Aid System for Urban Flooding Ⅰ Ⅱ Ⅲ
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- 4. 4 Background1 ￭ Vietnam ispursuing an active response to climate change and sustainable development as a national vision and requires the technology to support this. ￭ Increased demand is expected for the growing and increasingly diverse Vietnamese industries that are related to an efficient response to climate change disasters ￭ Vietnam Disaster Preventive Urban Planning Frame is needed to manage the climate change disaster risk relating to urban development and infrastructure construction
- 5. 5 Vietnam(VUPDA)-Korea(KRIHS) Joint Project2 ￭Demands of Vietnam using the outcomes of the urban flooding research (Korea Research Institute for Human Settlements (KRIHS) over the past 3 years (2016-2018) ) - MOU between the KRIHS and VUPDA in 2012 - In July 2017, Vietnamese public officials and professors participated in the ‘KOICA Climate Change Response Training Program’ hosted by the Global Development Partnership Center (GDPC) of KRIHS. - In December 2017, ‘A preliminary study for establishing climate change response strategies for Vietnam’s local governments’ is conducted by VUPDA with budgetary support from the GDPC of KRIHS <KRIHS-VUPDA MOU(2012.5.18)> < KOICA Training Program Vietnam Action Plan><2017 KOICA Climate Change Response Training Program> <KIRHS-VUPDA preliminary study >
- 6. 6 ￭ Support toVietnam through the differentiated analytical methods and expert personnel related to disaster prevention that have been pushed forward by Korean urban planning. < ‘(Heavy rain disaster) Urban planning support system and urban planning information provision method’ patent > - A patent has been registered for ‘(Heavy rain disaster) Urban planning support system and urban planning information provision method’ as a result of R&D project performed by KRIHS from 2011 to 2016 - Also, KRIHS completed the development of ‘Support system for urban flooding prevention measures’ under its own research budget. Currently, pilot projects are being applied to local governments such as Busan and Jeju. < Support system for urban flooding prevention measures > Disaster Risk Prevention Aid System for Urban Flooding Korean Support System for Urban Flooding Prevention Measures Vietnam Disaster Risk Prevention Aid System for Urban Flooding
- 7. Urban Flood ManagementStrategyⅡ.
- 8. 8 Comprehensive DisasterPrevention System needs to be constructed in which all the constituents of a city respond in harmony to an impending disaster < Measures for Disaster Prevention in Cities based on Disaster Size > Basic Direction of Disaster Prevention against Climate Change1
- 9. 9 Multi-Scale DisasterVulnerability Analysis, Disaster Preventive Urban Planning
- 10. 10 < Comprehensive disastervulnerability analysis process > Current disaster vulnerability Future disaster vulnerability Future-new disaster vulnerable area Comprehensive disaster vulnerability (draft) Comprehensive urban disaster vulnerability 1 2 3 4 5 City-level comprehensive disaster vulnerability
- 11. 11 What isPSR Strategy? Multilayered urban disaster prevention strategy that delays runoff of rainwater or stores it ‘’layer after layer” taking characteristics of the scope of direct and indirect disaster influences into consideration < PSR Strategy Concept > P ★ S RS R ★ P R P S Grade1 Grade2 Grade3 R S P Comprehensive Disaster Prevention System: PSR Strategy2
- 12. 12 Illustration ofPSR-based disaster reducing urban design techniques 1. Flood damage influencing area division 2. Land use arrangement 3. Disaster vulnerable area(S) measures 4. Urban responding area(R) measures Low risk areas(R) Medium risk areas(S2) High risk areas(S1) Low Lands High Lands Medium risk areas(S2) Low risk areas(R) Medium risk areas(S2) High risk areas(S1) Construction of Retention Facility Elevation of Ground Level / Buildings Resistant to Flooding Low risk areas(R) Medium risk areas(S2) High risk areas(S1) Residential Districts Commercial Districts Sports, Leisure Districts Open Space Road Drainage Permeable Pavement Wetlands Green Roof Rain Barrel Temporary Retention Pond Constant Retention Pond Floodplain Manmade Wetland
- 13. 13 ▲Debris Barrier Infiltration▼ ◀Set Back SetBack▶ ▲Park Ecological Pond ▼ ▲ Open Space ▲Retention ◀ Retention ▼ Building Arrangement ▲ Buffer Green Belt 예상침수위 ◀ Building Arrangement
- 14. Disaster Risk PreventionAid System for Urban FloodingⅢ.
- 15. 15 Develop and distributedecision support system technology to support people who lack basic knowledge of urban flooding and disaster prevention Goal of Project1 Final Outcomes Basic data DB and policy application plan for urban flooding analysis and management in Vietnam Detailed risk information for the key urban flooding management areas and determining the scope of authority Support program for urban flood prevention measures Systemization of Vietnam Urban Flooding Vulnerability Analysis Support for Vietnam Urban Flooding Preventive Urban Planning “ConstructionofVietnamDisasterRiskPreventionAidSystemforUrbanFlooding toMaketheVietnamcitiesGreen,Smart,andResilient”
- 16. 16 Simulation ofthe potential rise of rivers in rainfall scenario using HEC-RAS model(River flood) Simulation of overflow at each manhole site in rainfall scenario using SWMM model(Inland flood) Analyzing Urban flood (Inland flood) Calculation of flow velocity and inundation depth Using Two-Dimensional flow analysis (Song et al., 2016) System Main Functions2
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- 18. 18 Flood Risk-BasedZonning for Urban Areas Classification of zones Accountability of Prevention measures Operational Definition - Criterion (inland flood) at 1/30yr Condition - Criterion (river flood) at 1/100yr Condition Red Zone Compulsory Places where heavy rainfall may cause very serious impacts Over 100cm Orange Zone Strongly Encouraged Places where heavy rainfall may cause substantial impacts 50cm to 100cm Yellow Zone Encouraged Places where heavy rainfall may cause noticeable impacts 10cm to 50cm Green Zone Not considered Places where heavy rainfall may not cause noticeable impacts Below 10cm * In case that zones at 1/30yr and 1/100yr conditions are different from each other, the zone with the higher level is finally designated. The criteria on risk-based zoning were selected in consideration of the risk matrix presented in ‘ISO 31000 Risk management’ M S T H K
- 19. 19 Analyzing SocialDimensions of Flood Risks Developing a total of 11 type of maps Public office WatersupplyFac. Educational Fac. Road Old&UndergroundBul. Old Bui. Underground Bui. Total Bui.
- 20. 20 Selection ofHigh-Risk Areas Application of Multi-Criteria Decision Making(MCDM) technique - Apply a total of 10 evaluation criteria (inland flood, river flood, population, land use etc.)
- 21. 21 Support toestablish disaster prevention measures GAIA Plane Analysis Composition of disaster prevention measures for urban flooding Field Survey Systemization of plan-based, facility-based, and management-based measures in accordance with the risk-weightd cause Reflect urban planning measures when designating disaster prevention districts and establishing disaster prevention plans - Social acceptability - Economic efficiency - Administrative burden . . . Vulerability (Building) Exposure(Population) Inland Flood
- 22. 22 Main FunctionsFlow Summary
- 23. 23 Disaster RiskPrevention Aid System for Urban Flooding Interface Disaster Risk Prevention Aid System for Urban Flooding · Developed to be easily accessible and used for disaster prevention planning
- 24. 24 Expected Effects andUsage3 Demand for technology • Practitioners and local governments in Vietnam that conduct urban flood vulnerability analysis • Disaster prevention urban planning can be established for the creation of disaster-safe cities as it is possible to interact with the practitioners and public officials on the analysis of existing flood vulnerabilities in Vietnam • Service companies that analyze urban flood vulnerabilities and establish disaster prevention urban plans in Vietnam • Main agents of the urban flood prevention urban development project in Vietnam (participation in projects related to international organizations such as World Bank and ADB) On site application • Utilization of a developed support system for urban flood prevention measures for the disaster vulnerability analyses of local governments in Vietnam • Utilization of a system developed by companies that perform urban flood vulnerability analysis in Vietnam • Monitoring of improvements, inadequacies, and deficiencies compared to existing practices • Provision of information about flood-vulnerable areas in Vietnam and disaster prevention guidelines Practical use and commercialization • Development of products based on the Vietnam urban flood vulnerability analysis techniques and algorithms • Commercial products can be developed based on the urban flood vulnerability analysis techniques and methodologies for Vietnam • Market targeting the sources of demand that perform research and work on urban flood vulnerability analysis in Vietnam such as universities, research institutes, engineering companies, municipalities, and public institutions.
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